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<FONT color="green">001</FONT>    package project3.three;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import project3.lex.Lex;<a name="line.3"></a>
<FONT color="green">004</FONT>    import project3.lex.TokenType;<a name="line.4"></a>
<FONT color="green">005</FONT>    import project3.RuleList;<a name="line.5"></a>
<FONT color="green">006</FONT>    <a name="line.6"></a>
<FONT color="green">007</FONT>    /**<a name="line.7"></a>
<FONT color="green">008</FONT>     * The Parser portion of the Datalog Program.<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     * &lt;p&gt;<a name="line.10"></a>
<FONT color="green">011</FONT>     * Syntax:<a name="line.11"></a>
<FONT color="green">012</FONT>     * &lt;table&gt;<a name="line.12"></a>
<FONT color="green">013</FONT>     * &lt;tr&gt;<a name="line.13"></a>
<FONT color="green">014</FONT>     *   &lt;td&gt;&lt;b&gt;DataLogProgram&lt;/b&gt;&lt;/td&gt;<a name="line.14"></a>
<FONT color="green">015</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.15"></a>
<FONT color="green">016</FONT>     *   &lt;td&gt;&lt;b&gt;SchemeList&lt;/b&gt;&lt;/td&gt;<a name="line.16"></a>
<FONT color="green">017</FONT>     * &lt;/tr&gt;<a name="line.17"></a>
<FONT color="green">018</FONT>     * &lt;tr&gt;<a name="line.18"></a>
<FONT color="green">019</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.19"></a>
<FONT color="green">020</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.20"></a>
<FONT color="green">021</FONT>     *   &lt;td&gt;&lt;b&gt;FactList&lt;/b&gt;&lt;/td&gt;<a name="line.21"></a>
<FONT color="green">022</FONT>     * &lt;/tr&gt;<a name="line.22"></a>
<FONT color="green">023</FONT>     * &lt;tr&gt;<a name="line.23"></a>
<FONT color="green">024</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.24"></a>
<FONT color="green">025</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.25"></a>
<FONT color="green">026</FONT>     *   &lt;td&gt;&lt;b&gt;RuleList&lt;/b&gt;&lt;/td&gt;<a name="line.26"></a>
<FONT color="green">027</FONT>     * &lt;/tr&gt;<a name="line.27"></a>
<FONT color="green">028</FONT>     * &lt;tr&gt;<a name="line.28"></a>
<FONT color="green">029</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.29"></a>
<FONT color="green">030</FONT>     *   &lt;td&gt;&amp;nbsp;&lt;/td&gt;<a name="line.30"></a>
<FONT color="green">031</FONT>     *   &lt;td&gt;&lt;b&gt;QueryList&lt;/b&gt;&lt;/td&gt;<a name="line.31"></a>
<FONT color="green">032</FONT>     * &lt;/tr&gt;<a name="line.32"></a>
<FONT color="green">033</FONT>     * &lt;tr&gt;<a name="line.33"></a>
<FONT color="green">034</FONT>     *   &lt;td&gt;&lt;b&gt;SchemeList&lt;/b&gt;&lt;/td&gt;<a name="line.34"></a>
<FONT color="green">035</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>     *   &lt;td&gt;"Schemes" ":" &lt;b&gt;Scheme&lt;/b&gt;+&lt;/td&gt;<a name="line.36"></a>
<FONT color="green">037</FONT>     * &lt;/tr&gt;<a name="line.37"></a>
<FONT color="green">038</FONT>     * &lt;tr&gt;<a name="line.38"></a>
<FONT color="green">039</FONT>     *   &lt;td&gt;&lt;b&gt;Scheme&lt;/b&gt;&lt;/td&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.40"></a>
<FONT color="green">041</FONT>     *   &lt;td&gt;&lt;i&gt;Identifier&lt;/i&gt; "(" &lt;i&gt;Identifier&lt;/i&gt; ["," &lt;i&gt;Identifier&lt;/i&gt;]* ")"&lt;/td&gt;<a name="line.41"></a>
<FONT color="green">042</FONT>     * &lt;/tr&gt;<a name="line.42"></a>
<FONT color="green">043</FONT>     * &lt;tr&gt;<a name="line.43"></a>
<FONT color="green">044</FONT>     *   &lt;td&gt;&lt;b&gt;FactList&lt;/b&gt;&lt;/td&gt;<a name="line.44"></a>
<FONT color="green">045</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>     *   &lt;td&gt;"Facts" ":" &lt;b&gt;Fact&lt;/b&gt;*&lt;/td&gt;<a name="line.46"></a>
<FONT color="green">047</FONT>     * &lt;/tr&gt;<a name="line.47"></a>
<FONT color="green">048</FONT>     * &lt;tr&gt;<a name="line.48"></a>
<FONT color="green">049</FONT>     *   &lt;td&gt;&lt;b&gt;Fact&lt;/b&gt;&lt;/td&gt;<a name="line.49"></a>
<FONT color="green">050</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.50"></a>
<FONT color="green">051</FONT>     *   &lt;td&gt;&lt;i&gt;Identifier&lt;/i&gt; "(" &lt;i&gt;Constant&lt;/i&gt; ["," &lt;i&gt;Constant&lt;/i&gt;]* ")" "."&lt;/td&gt;<a name="line.51"></a>
<FONT color="green">052</FONT>     * &lt;/tr&gt;<a name="line.52"></a>
<FONT color="green">053</FONT>     * &lt;tr&gt;<a name="line.53"></a>
<FONT color="green">054</FONT>     *   &lt;td&gt;&lt;b&gt;RuleList&lt;/b&gt;&lt;/td&gt;<a name="line.54"></a>
<FONT color="green">055</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.55"></a>
<FONT color="green">056</FONT>     *   &lt;td&gt;"Rules" ":" &lt;b&gt;Rule&lt;/b&gt;*&lt;/td&gt;<a name="line.56"></a>
<FONT color="green">057</FONT>     * &lt;/tr&gt;<a name="line.57"></a>
<FONT color="green">058</FONT>     * &lt;tr&gt;<a name="line.58"></a>
<FONT color="green">059</FONT>     *   &lt;td&gt;&lt;b&gt;Rule&lt;/b&gt;&lt;/td&gt;<a name="line.59"></a>
<FONT color="green">060</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.60"></a>
<FONT color="green">061</FONT>     *   &lt;td&gt;&lt;b&gt;Head&lt;/b&gt; ":-" &lt;b&gt;PredicateList&lt;/b&gt; "."&lt;/td&gt;<a name="line.61"></a>
<FONT color="green">062</FONT>     * &lt;/tr&gt;<a name="line.62"></a>
<FONT color="green">063</FONT>     * &lt;tr&gt;<a name="line.63"></a>
<FONT color="green">064</FONT>     *   &lt;td&gt;&lt;b&gt;Head&lt;/b&gt;&lt;/td&gt;<a name="line.64"></a>
<FONT color="green">065</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.65"></a>
<FONT color="green">066</FONT>     *   &lt;td&gt;&lt;b&gt;Scheme&lt;/b&gt;&lt;/td&gt;<a name="line.66"></a>
<FONT color="green">067</FONT>     * &lt;/tr&gt;<a name="line.67"></a>
<FONT color="green">068</FONT>     * &lt;tr&gt;<a name="line.68"></a>
<FONT color="green">069</FONT>     *   &lt;td&gt;&lt;b&gt;PredicateList&lt;/b&gt;&lt;/td&gt;<a name="line.69"></a>
<FONT color="green">070</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.70"></a>
<FONT color="green">071</FONT>     *   &lt;td&gt;&lt;b&gt;Predicate&lt;/b&gt; ["," &lt;b&gt;Predicate&lt;/b&gt; ]*&lt;/td&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>     * &lt;/tr&gt;<a name="line.72"></a>
<FONT color="green">073</FONT>     * &lt;tr&gt;<a name="line.73"></a>
<FONT color="green">074</FONT>     *   &lt;td&gt;&lt;b&gt;Predicate&lt;/b&gt;&lt;/td&gt;<a name="line.74"></a>
<FONT color="green">075</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.75"></a>
<FONT color="green">076</FONT>     *   &lt;td&gt;&lt;i&gt;Identifier&lt;/i&gt; "(" &lt;b&gt;Argument&lt;/b&gt; [ "," &lt;b&gt;Argument&lt;/b&gt; ]* ")"&lt;/td&gt;<a name="line.76"></a>
<FONT color="green">077</FONT>     * &lt;/tr&gt;<a name="line.77"></a>
<FONT color="green">078</FONT>     * &lt;tr&gt;<a name="line.78"></a>
<FONT color="green">079</FONT>     *   &lt;td&gt;&lt;b&gt;Argument&lt;/b&gt;&lt;/td&gt;<a name="line.79"></a>
<FONT color="green">080</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.80"></a>
<FONT color="green">081</FONT>     *   &lt;td&gt;&lt;i&gt;Identifier&lt;/i&gt; | &lt;i&gt;Constant&lt;/i&gt;&lt;/td&gt;<a name="line.81"></a>
<FONT color="green">082</FONT>     * &lt;/tr&gt;<a name="line.82"></a>
<FONT color="green">083</FONT>     * &lt;tr&gt;<a name="line.83"></a>
<FONT color="green">084</FONT>     *   &lt;td&gt;&lt;b&gt;QueryList&lt;/b&gt;&lt;/td&gt;<a name="line.84"></a>
<FONT color="green">085</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.85"></a>
<FONT color="green">086</FONT>     *   &lt;td&gt;"Queries" ":" &lt;b&gt;Query&lt;b&gt;*&lt;/td&gt;<a name="line.86"></a>
<FONT color="green">087</FONT>     * &lt;/tr&gt;<a name="line.87"></a>
<FONT color="green">088</FONT>     * &lt;tr&gt;<a name="line.88"></a>
<FONT color="green">089</FONT>     *   &lt;td&gt;&lt;b&gt;Query&lt;/b&gt;&lt;/td&gt;<a name="line.89"></a>
<FONT color="green">090</FONT>     *   &lt;td&gt;&amp;rarr;&lt;/td&gt;<a name="line.90"></a>
<FONT color="green">091</FONT>     *   &lt;td&gt;&lt;b&gt;Predicate&lt;/b&gt; "?"&lt;/td&gt;<a name="line.91"></a>
<FONT color="green">092</FONT>     * &lt;/tr&gt;<a name="line.92"></a>
<FONT color="green">093</FONT>     * &lt;table&gt;<a name="line.93"></a>
<FONT color="green">094</FONT>     *<a name="line.94"></a>
<FONT color="green">095</FONT>     * &lt;pre&gt;<a name="line.95"></a>
<FONT color="green">096</FONT>     * Domain Definition:<a name="line.96"></a>
<FONT color="green">097</FONT>     *     schemeList: SchemeList<a name="line.97"></a>
<FONT color="green">098</FONT>     *     factList  : FactList<a name="line.98"></a>
<FONT color="green">099</FONT>     *     ruleList  : RuleList<a name="line.99"></a>
<FONT color="green">100</FONT>     *     queryList : QueryList<a name="line.100"></a>
<FONT color="green">101</FONT>     * &lt;pre&gt;<a name="line.101"></a>
<FONT color="green">102</FONT>     * Last Modified: 21 Feb 2006<a name="line.102"></a>
<FONT color="green">103</FONT>     * @author Scott N. Woodfield<a name="line.103"></a>
<FONT color="green">104</FONT>     * @version 1.0<a name="line.104"></a>
<FONT color="green">105</FONT>     * @see &lt;a href="../../srchtml/project3/DatalogProgram.html"&gt;Source Code&lt;/a&gt;<a name="line.105"></a>
<FONT color="green">106</FONT>     */<a name="line.106"></a>
<FONT color="green">107</FONT>    public class DatalogProgram<a name="line.107"></a>
<FONT color="green">108</FONT>        extends Node<a name="line.108"></a>
<FONT color="green">109</FONT>    {<a name="line.109"></a>
<FONT color="green">110</FONT>    //Domain Implementation<a name="line.110"></a>
<FONT color="green">111</FONT>        /**<a name="line.111"></a>
<FONT color="green">112</FONT>         * The schemeList implementation.<a name="line.112"></a>
<FONT color="green">113</FONT>         * @see<a name="line.113"></a>
<FONT color="green">114</FONT>         *   &lt;a href=<a name="line.114"></a>
<FONT color="green">115</FONT>         *      "../../srchtml/project3/DatalogProgram.html#schemeList"&gt;Source Code&lt;/a&gt;<a name="line.115"></a>
<FONT color="green">116</FONT>         */<a name="line.116"></a>
<FONT color="green">117</FONT>        protected SchemeList schemeList;<a name="line.117"></a>
<FONT color="green">118</FONT>    <a name="line.118"></a>
<FONT color="green">119</FONT>        /**<a name="line.119"></a>
<FONT color="green">120</FONT>         * The factList implementation.<a name="line.120"></a>
<FONT color="green">121</FONT>         * @see<a name="line.121"></a>
<FONT color="green">122</FONT>         *   &lt;a href=<a name="line.122"></a>
<FONT color="green">123</FONT>         *      "../../srchtml/project3/DatalogProgram.html#factList"&gt;Source Code&lt;/a&gt;<a name="line.123"></a>
<FONT color="green">124</FONT>         */<a name="line.124"></a>
<FONT color="green">125</FONT>        protected FactList factList;<a name="line.125"></a>
<FONT color="green">126</FONT>    <a name="line.126"></a>
<FONT color="green">127</FONT>        /**<a name="line.127"></a>
<FONT color="green">128</FONT>         * The ruleList implementation.<a name="line.128"></a>
<FONT color="green">129</FONT>         * @see<a name="line.129"></a>
<FONT color="green">130</FONT>         *   &lt;a href=<a name="line.130"></a>
<FONT color="green">131</FONT>         *      "../../srchtml/project3/DatalogProgram.html#ruleList"&gt;Source Code&lt;/a&gt;<a name="line.131"></a>
<FONT color="green">132</FONT>         */<a name="line.132"></a>
<FONT color="green">133</FONT>        protected RuleList ruleList;<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        /**<a name="line.135"></a>
<FONT color="green">136</FONT>         * The queryList implementation.<a name="line.136"></a>
<FONT color="green">137</FONT>         * @see<a name="line.137"></a>
<FONT color="green">138</FONT>         *   &lt;a href=<a name="line.138"></a>
<FONT color="green">139</FONT>         *      "../../srchtml/project3/DatalogProgram.html#queryList"&gt;Source Code&lt;/a&gt;<a name="line.139"></a>
<FONT color="green">140</FONT>         */<a name="line.140"></a>
<FONT color="green">141</FONT>        protected QueryList queryList;<a name="line.141"></a>
<FONT color="green">142</FONT>    <a name="line.142"></a>
<FONT color="green">143</FONT>    //Constructors<a name="line.143"></a>
<FONT color="green">144</FONT>        /**<a name="line.144"></a>
<FONT color="green">145</FONT>         * Creates a datalog program from the tokens in the lexical analyzer.<a name="line.145"></a>
<FONT color="green">146</FONT>         *<a name="line.146"></a>
<FONT color="green">147</FONT>         * &lt;p&gt;<a name="line.147"></a>
<FONT color="green">148</FONT>         * &lt;table&gt;<a name="line.148"></a>
<FONT color="green">149</FONT>         *   &lt;tr&gt;<a name="line.149"></a>
<FONT color="green">150</FONT>         *     &lt;td valign=top&gt;<a name="line.150"></a>
<FONT color="green">151</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.151"></a>
<FONT color="green">152</FONT>         *     &lt;/td&gt;<a name="line.152"></a>
<FONT color="green">153</FONT>         *     &lt;td valign=top&gt;<a name="line.153"></a>
<FONT color="green">154</FONT>         *       lex &amp;ne; null &lt;br/&gt;<a name="line.154"></a>
<FONT color="green">155</FONT>         *       lex is a syntatically valid datalog program<a name="line.155"></a>
<FONT color="green">156</FONT>         *     &lt;/td&gt;<a name="line.156"></a>
<FONT color="green">157</FONT>         *     &lt;td valign=top&gt;<a name="line.157"></a>
<FONT color="green">158</FONT>         *       AND &lt;br/&gt;<a name="line.158"></a>
<FONT color="green">159</FONT>         *       &amp;nbsp;<a name="line.159"></a>
<FONT color="green">160</FONT>         *     &lt;/td&gt;<a name="line.160"></a>
<FONT color="green">161</FONT>         *   &lt;/tr&gt;<a name="line.161"></a>
<FONT color="green">162</FONT>         *   &lt;tr&gt;<a name="line.162"></a>
<FONT color="green">163</FONT>         *     &lt;td valign=top&gt;<a name="line.163"></a>
<FONT color="green">164</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.164"></a>
<FONT color="green">165</FONT>         *     &lt;/td&gt;<a name="line.165"></a>
<FONT color="green">166</FONT>         *     &lt;td valign=top&gt;<a name="line.166"></a>
<FONT color="green">167</FONT>         *       schemeList = new SchemeList(lex) &lt;br/&gt;<a name="line.167"></a>
<FONT color="green">168</FONT>         *       lex' = lex after creating schemeList &lt;br/&gt;<a name="line.168"></a>
<FONT color="green">169</FONT>         *       factList   = new FactList(lex')   &lt;br/&gt;<a name="line.169"></a>
<FONT color="green">170</FONT>         *       lex'' = lex' after creating schemeList &lt;br/&gt;<a name="line.170"></a>
<FONT color="green">171</FONT>         *       ruleList   = new RuleList(lex'')   &lt;br/&gt;<a name="line.171"></a>
<FONT color="green">172</FONT>         *       lex''' = lex'' after creating schemeList &lt;br/&gt;<a name="line.172"></a>
<FONT color="green">173</FONT>         *       queryList  = new QueryList(lex''')<a name="line.173"></a>
<FONT color="green">174</FONT>         *     &lt;/td&gt;<a name="line.174"></a>
<FONT color="green">175</FONT>         *     &lt;td valign=top&gt;<a name="line.175"></a>
<FONT color="green">176</FONT>         *       AND &lt;br/&gt;<a name="line.176"></a>
<FONT color="green">177</FONT>         *       AND &lt;br/&gt;<a name="line.177"></a>
<FONT color="green">178</FONT>         *       AND &lt;br/&gt;<a name="line.178"></a>
<FONT color="green">179</FONT>         *       AND &lt;br/&gt;<a name="line.179"></a>
<FONT color="green">180</FONT>         *       AND &lt;br/&gt;<a name="line.180"></a>
<FONT color="green">181</FONT>         *       AND &lt;br/&gt;<a name="line.181"></a>
<FONT color="green">182</FONT>         *       &amp;nbsp;<a name="line.182"></a>
<FONT color="green">183</FONT>         *     &lt;/td&gt;<a name="line.183"></a>
<FONT color="green">184</FONT>         *   &lt;/tr&gt;<a name="line.184"></a>
<FONT color="green">185</FONT>         * &lt;/table&gt;<a name="line.185"></a>
<FONT color="green">186</FONT>         *<a name="line.186"></a>
<FONT color="green">187</FONT>         * @throws ParserException<a name="line.187"></a>
<FONT color="green">188</FONT>         *<a name="line.188"></a>
<FONT color="green">189</FONT>         * @param lex the lexical analyzer we will create a &lt;b&gt;DatalogProgram&lt;/b&gt;<a name="line.189"></a>
<FONT color="green">190</FONT>         *        from.<a name="line.190"></a>
<FONT color="green">191</FONT>         * @see<a name="line.191"></a>
<FONT color="green">192</FONT>         *   &lt;a href=<a name="line.192"></a>
<FONT color="green">193</FONT>         *      "../../srchtml/project3/DatalogProgram.html#LexConstructor"<a name="line.193"></a>
<FONT color="green">194</FONT>         *      &gt;Source Code<a name="line.194"></a>
<FONT color="green">195</FONT>         *   &lt;/a&gt;<a name="line.195"></a>
<FONT color="green">196</FONT>         */<a name="line.196"></a>
<FONT color="green">197</FONT>        public DatalogProgram(Lex lex)<a name="line.197"></a>
<FONT color="green">198</FONT>            throws ParserException<a name="line.198"></a>
<FONT color="green">199</FONT>        {<a name="line.199"></a>
<FONT color="green">200</FONT>            Domain.reset();<a name="line.200"></a>
<FONT color="green">201</FONT>            schemeList = new SchemeList(lex);<a name="line.201"></a>
<FONT color="green">202</FONT>            factList = new FactList(lex);<a name="line.202"></a>
<FONT color="green">203</FONT>            ruleList = new RuleList(lex);<a name="line.203"></a>
<FONT color="green">204</FONT>            queryList = new QueryList(lex);<a name="line.204"></a>
<FONT color="green">205</FONT>    <a name="line.205"></a>
<FONT color="green">206</FONT>            checkFor(lex, TokenType.EOF);<a name="line.206"></a>
<FONT color="green">207</FONT>        }<a name="line.207"></a>
<FONT color="green">208</FONT>    <a name="line.208"></a>
<FONT color="green">209</FONT>    //Queries<a name="line.209"></a>
<FONT color="green">210</FONT>        /**<a name="line.210"></a>
<FONT color="green">211</FONT>         * Converts the datalog program to a string.  Used for debugging purposes.<a name="line.211"></a>
<FONT color="green">212</FONT>         *<a name="line.212"></a>
<FONT color="green">213</FONT>         * &lt;p&gt;<a name="line.213"></a>
<FONT color="green">214</FONT>         * &lt;table&gt;<a name="line.214"></a>
<FONT color="green">215</FONT>         *   &lt;tr&gt;<a name="line.215"></a>
<FONT color="green">216</FONT>         *     &lt;td valign=top&gt;<a name="line.216"></a>
<FONT color="green">217</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.217"></a>
<FONT color="green">218</FONT>         *     &lt;/td&gt;<a name="line.218"></a>
<FONT color="green">219</FONT>         *     &lt;td valign=top&gt;<a name="line.219"></a>
<FONT color="green">220</FONT>         *       none<a name="line.220"></a>
<FONT color="green">221</FONT>         *     &lt;/td&gt;<a name="line.221"></a>
<FONT color="green">222</FONT>         *     &lt;td valign=top&gt;<a name="line.222"></a>
<FONT color="green">223</FONT>         *     &lt;/td&gt;<a name="line.223"></a>
<FONT color="green">224</FONT>         *   &lt;/tr&gt;<a name="line.224"></a>
<FONT color="green">225</FONT>         *   &lt;tr&gt;<a name="line.225"></a>
<FONT color="green">226</FONT>         *     &lt;td valign=top&gt;<a name="line.226"></a>
<FONT color="green">227</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.227"></a>
<FONT color="green">228</FONT>         *     &lt;/td&gt;<a name="line.228"></a>
<FONT color="green">229</FONT>         *     &lt;td valign=top&gt;<a name="line.229"></a>
<FONT color="green">230</FONT>         *       result = schemeList.toString() + factList.toString() +<a name="line.230"></a>
<FONT color="green">231</FONT>         *                ruleList.toString()   + queryList.toString()<a name="line.231"></a>
<FONT color="green">232</FONT>         *     &lt;/td&gt;<a name="line.232"></a>
<FONT color="green">233</FONT>         *     &lt;td valign=top&gt;<a name="line.233"></a>
<FONT color="green">234</FONT>         *     &lt;/td&gt;<a name="line.234"></a>
<FONT color="green">235</FONT>         *   &lt;/tr&gt;<a name="line.235"></a>
<FONT color="green">236</FONT>         * &lt;/table&gt;<a name="line.236"></a>
<FONT color="green">237</FONT>         *<a name="line.237"></a>
<FONT color="green">238</FONT>         * @return the string representation of a &lt;b&gt;DatalogProgram&lt;/b&gt;.<a name="line.238"></a>
<FONT color="green">239</FONT>         * @see<a name="line.239"></a>
<FONT color="green">240</FONT>         *   &lt;a href=<a name="line.240"></a>
<FONT color="green">241</FONT>         *      "../../srchtml/project3/DatalogProgram.html#toString"<a name="line.241"></a>
<FONT color="green">242</FONT>         *      &gt;Source Code<a name="line.242"></a>
<FONT color="green">243</FONT>         *   &lt;/a&gt;<a name="line.243"></a>
<FONT color="green">244</FONT>         */<a name="line.244"></a>
<FONT color="green">245</FONT>        public String toString()<a name="line.245"></a>
<FONT color="green">246</FONT>        {<a name="line.246"></a>
<FONT color="green">247</FONT>            StringBuffer result = new StringBuffer();<a name="line.247"></a>
<FONT color="green">248</FONT>            result.append(schemeList.toString());<a name="line.248"></a>
<FONT color="green">249</FONT>            result.append(factList.toString());<a name="line.249"></a>
<FONT color="green">250</FONT>            result.append(ruleList.toString());<a name="line.250"></a>
<FONT color="green">251</FONT>            result.append(queryList.toString());<a name="line.251"></a>
<FONT color="green">252</FONT>            return result.toString();<a name="line.252"></a>
<FONT color="green">253</FONT>        }<a name="line.253"></a>
<FONT color="green">254</FONT>    <a name="line.254"></a>
<FONT color="green">255</FONT>        /**<a name="line.255"></a>
<FONT color="green">256</FONT>         * Returns the factList part of a datalog program. This is the getter for<a name="line.256"></a>
<FONT color="green">257</FONT>         * factList.<a name="line.257"></a>
<FONT color="green">258</FONT>         *<a name="line.258"></a>
<FONT color="green">259</FONT>         * &lt;p&gt;<a name="line.259"></a>
<FONT color="green">260</FONT>         * &lt;table&gt;<a name="line.260"></a>
<FONT color="green">261</FONT>         *   &lt;tr&gt;<a name="line.261"></a>
<FONT color="green">262</FONT>         *     &lt;td valign=top&gt;<a name="line.262"></a>
<FONT color="green">263</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.263"></a>
<FONT color="green">264</FONT>         *     &lt;/td&gt;<a name="line.264"></a>
<FONT color="green">265</FONT>         *     &lt;td valign=top&gt;<a name="line.265"></a>
<FONT color="green">266</FONT>         *       none<a name="line.266"></a>
<FONT color="green">267</FONT>         *     &lt;/td&gt;<a name="line.267"></a>
<FONT color="green">268</FONT>         *     &lt;td valign=top&gt;<a name="line.268"></a>
<FONT color="green">269</FONT>         *     &lt;/td&gt;<a name="line.269"></a>
<FONT color="green">270</FONT>         *   &lt;/tr&gt;<a name="line.270"></a>
<FONT color="green">271</FONT>         *   &lt;tr&gt;<a name="line.271"></a>
<FONT color="green">272</FONT>         *     &lt;td valign=top&gt;<a name="line.272"></a>
<FONT color="green">273</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.273"></a>
<FONT color="green">274</FONT>         *     &lt;/td&gt;<a name="line.274"></a>
<FONT color="green">275</FONT>         *     &lt;td valign=top&gt;<a name="line.275"></a>
<FONT color="green">276</FONT>         *       result = factList<a name="line.276"></a>
<FONT color="green">277</FONT>         *     &lt;/td&gt;<a name="line.277"></a>
<FONT color="green">278</FONT>         *     &lt;td valign=top&gt;<a name="line.278"></a>
<FONT color="green">279</FONT>         *     &lt;/td&gt;<a name="line.279"></a>
<FONT color="green">280</FONT>         *   &lt;/tr&gt;<a name="line.280"></a>
<FONT color="green">281</FONT>         * &lt;/table&gt;<a name="line.281"></a>
<FONT color="green">282</FONT>         *<a name="line.282"></a>
<FONT color="green">283</FONT>         * @return the factList of this &lt;b&gt;DatalogProgram&lt;/b&gt;<a name="line.283"></a>
<FONT color="green">284</FONT>         * @see<a name="line.284"></a>
<FONT color="green">285</FONT>         *   &lt;a href=<a name="line.285"></a>
<FONT color="green">286</FONT>         *      "../../srchtml/project3/DatalogProgram.html#getFactList"<a name="line.286"></a>
<FONT color="green">287</FONT>         *      &gt;Source Code<a name="line.287"></a>
<FONT color="green">288</FONT>         *   &lt;/a&gt;<a name="line.288"></a>
<FONT color="green">289</FONT>         */<a name="line.289"></a>
<FONT color="green">290</FONT>        public FactList getFactList()<a name="line.290"></a>
<FONT color="green">291</FONT>        {<a name="line.291"></a>
<FONT color="green">292</FONT>            return factList;<a name="line.292"></a>
<FONT color="green">293</FONT>        }<a name="line.293"></a>
<FONT color="green">294</FONT>    <a name="line.294"></a>
<FONT color="green">295</FONT>        /**<a name="line.295"></a>
<FONT color="green">296</FONT>         * Returns the ruleList part of a datalog program.<a name="line.296"></a>
<FONT color="green">297</FONT>         *<a name="line.297"></a>
<FONT color="green">298</FONT>         * &lt;table&gt;<a name="line.298"></a>
<FONT color="green">299</FONT>         *   &lt;tr&gt;<a name="line.299"></a>
<FONT color="green">300</FONT>         *     &lt;td valign=top&gt;<a name="line.300"></a>
<FONT color="green">301</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.301"></a>
<FONT color="green">302</FONT>         *     &lt;/td&gt;<a name="line.302"></a>
<FONT color="green">303</FONT>         *     &lt;td valign=top&gt;<a name="line.303"></a>
<FONT color="green">304</FONT>         *       none<a name="line.304"></a>
<FONT color="green">305</FONT>         *     &lt;/td&gt;<a name="line.305"></a>
<FONT color="green">306</FONT>         *     &lt;td valign=top&gt;<a name="line.306"></a>
<FONT color="green">307</FONT>         *     &lt;/td&gt;<a name="line.307"></a>
<FONT color="green">308</FONT>         *   &lt;/tr&gt;<a name="line.308"></a>
<FONT color="green">309</FONT>         *   &lt;tr&gt;<a name="line.309"></a>
<FONT color="green">310</FONT>         *     &lt;td valign=top&gt;<a name="line.310"></a>
<FONT color="green">311</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.311"></a>
<FONT color="green">312</FONT>         *     &lt;/td&gt;<a name="line.312"></a>
<FONT color="green">313</FONT>         *     &lt;td valign=top&gt;<a name="line.313"></a>
<FONT color="green">314</FONT>         *       result = ruleList<a name="line.314"></a>
<FONT color="green">315</FONT>         *     &lt;/td&gt;<a name="line.315"></a>
<FONT color="green">316</FONT>         *     &lt;td valign=top&gt;<a name="line.316"></a>
<FONT color="green">317</FONT>         *     &lt;/td&gt;<a name="line.317"></a>
<FONT color="green">318</FONT>         *   &lt;/tr&gt;<a name="line.318"></a>
<FONT color="green">319</FONT>         * &lt;/table&gt;<a name="line.319"></a>
<FONT color="green">320</FONT>         *<a name="line.320"></a>
<FONT color="green">321</FONT>         * @return the ruleList of this &lt;b&gt;DatalogProgram&lt;/b&gt;<a name="line.321"></a>
<FONT color="green">322</FONT>         * @see<a name="line.322"></a>
<FONT color="green">323</FONT>         *   &lt;a href=<a name="line.323"></a>
<FONT color="green">324</FONT>         *      "../../srchtml/project3/DatalogProgram.html#getRuleList"<a name="line.324"></a>
<FONT color="green">325</FONT>         *      &gt;Source Code<a name="line.325"></a>
<FONT color="green">326</FONT>         *   &lt;/a&gt;<a name="line.326"></a>
<FONT color="green">327</FONT>         */<a name="line.327"></a>
<FONT color="green">328</FONT>        public RuleList getRuleList()<a name="line.328"></a>
<FONT color="green">329</FONT>        {<a name="line.329"></a>
<FONT color="green">330</FONT>            return ruleList;<a name="line.330"></a>
<FONT color="green">331</FONT>        }<a name="line.331"></a>
<FONT color="green">332</FONT>    <a name="line.332"></a>
<FONT color="green">333</FONT>        /**<a name="line.333"></a>
<FONT color="green">334</FONT>         * Returns the queryList part of the program, used for primarily for<a name="line.334"></a>
<FONT color="green">335</FONT>         * testing.<a name="line.335"></a>
<FONT color="green">336</FONT>         *<a name="line.336"></a>
<FONT color="green">337</FONT>         * &lt;table&gt;<a name="line.337"></a>
<FONT color="green">338</FONT>         *   &lt;tr&gt;<a name="line.338"></a>
<FONT color="green">339</FONT>         *     &lt;td valign=top&gt;<a name="line.339"></a>
<FONT color="green">340</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.340"></a>
<FONT color="green">341</FONT>         *     &lt;/td&gt;<a name="line.341"></a>
<FONT color="green">342</FONT>         *     &lt;td valign=top&gt;<a name="line.342"></a>
<FONT color="green">343</FONT>         *       none<a name="line.343"></a>
<FONT color="green">344</FONT>         *     &lt;/td&gt;<a name="line.344"></a>
<FONT color="green">345</FONT>         *     &lt;td valign=top&gt;<a name="line.345"></a>
<FONT color="green">346</FONT>         *     &lt;/td&gt;<a name="line.346"></a>
<FONT color="green">347</FONT>         *   &lt;/tr&gt;<a name="line.347"></a>
<FONT color="green">348</FONT>         *   &lt;tr&gt;<a name="line.348"></a>
<FONT color="green">349</FONT>         *     &lt;td valign=top&gt;<a name="line.349"></a>
<FONT color="green">350</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.350"></a>
<FONT color="green">351</FONT>         *     &lt;/td&gt;<a name="line.351"></a>
<FONT color="green">352</FONT>         *     &lt;td valign=top&gt;<a name="line.352"></a>
<FONT color="green">353</FONT>         *       result = queryList<a name="line.353"></a>
<FONT color="green">354</FONT>         *     &lt;/td&gt;<a name="line.354"></a>
<FONT color="green">355</FONT>         *     &lt;td valign=top&gt;<a name="line.355"></a>
<FONT color="green">356</FONT>         *     &lt;/td&gt;<a name="line.356"></a>
<FONT color="green">357</FONT>         *   &lt;/tr&gt;<a name="line.357"></a>
<FONT color="green">358</FONT>         * &lt;/table&gt;<a name="line.358"></a>
<FONT color="green">359</FONT>         *<a name="line.359"></a>
<FONT color="green">360</FONT>         * @return the queryList of this &lt;b&gt;DatalogProgram&lt;/b&gt;<a name="line.360"></a>
<FONT color="green">361</FONT>         * @see<a name="line.361"></a>
<FONT color="green">362</FONT>         *   &lt;a href=<a name="line.362"></a>
<FONT color="green">363</FONT>         *      "../../srchtml/project3/DatalogProgram.html#getQueryList"<a name="line.363"></a>
<FONT color="green">364</FONT>         *      &gt;Source Code<a name="line.364"></a>
<FONT color="green">365</FONT>         *   &lt;/a&gt;<a name="line.365"></a>
<FONT color="green">366</FONT>         */<a name="line.366"></a>
<FONT color="green">367</FONT>        public QueryList getQueryList()<a name="line.367"></a>
<FONT color="green">368</FONT>        {<a name="line.368"></a>
<FONT color="green">369</FONT>            return queryList;<a name="line.369"></a>
<FONT color="green">370</FONT>        }<a name="line.370"></a>
<FONT color="green">371</FONT>    <a name="line.371"></a>
<FONT color="green">372</FONT>    <a name="line.372"></a>
<FONT color="green">373</FONT>    //Commands<a name="line.373"></a>
<FONT color="green">374</FONT>        /**<a name="line.374"></a>
<FONT color="green">375</FONT>         * Evaluates all of the queries in the program.<a name="line.375"></a>
<FONT color="green">376</FONT>         *<a name="line.376"></a>
<FONT color="green">377</FONT>         * &lt;p&gt;<a name="line.377"></a>
<FONT color="green">378</FONT>         * &lt;table&gt;<a name="line.378"></a>
<FONT color="green">379</FONT>         *   &lt;tr&gt;<a name="line.379"></a>
<FONT color="green">380</FONT>         *     &lt;td valign=top&gt;<a name="line.380"></a>
<FONT color="green">381</FONT>         *       &lt;b&gt;Precondition&lt;/b&gt;:<a name="line.381"></a>
<FONT color="green">382</FONT>         *     &lt;/td&gt;<a name="line.382"></a>
<FONT color="green">383</FONT>         *     &lt;td valign=top&gt;<a name="line.383"></a>
<FONT color="green">384</FONT>         *       strBuffer &amp;ne; null<a name="line.384"></a>
<FONT color="green">385</FONT>         *     &lt;/td&gt;<a name="line.385"></a>
<FONT color="green">386</FONT>         *     &lt;td valign=top&gt;<a name="line.386"></a>
<FONT color="green">387</FONT>         *     &lt;/td&gt;<a name="line.387"></a>
<FONT color="green">388</FONT>         *   &lt;/tr&gt;<a name="line.388"></a>
<FONT color="green">389</FONT>         *   &lt;tr&gt;<a name="line.389"></a>
<FONT color="green">390</FONT>         *     &lt;td valign=top&gt;<a name="line.390"></a>
<FONT color="green">391</FONT>         *       &lt;b&gt;Postcondition&lt;/b&gt;:<a name="line.391"></a>
<FONT color="green">392</FONT>         *     &lt;/td&gt;<a name="line.392"></a>
<FONT color="green">393</FONT>         *     &lt;td valign=top&gt;<a name="line.393"></a>
<FONT color="green">394</FONT>         *       the results of all the evaluated queries are stored in<a name="line.394"></a>
<FONT color="green">395</FONT>         *       strBuffer.<a name="line.395"></a>
<FONT color="green">396</FONT>         *     &lt;/td&gt;<a name="line.396"></a>
<FONT color="green">397</FONT>         *     &lt;td valign=top&gt;<a name="line.397"></a>
<FONT color="green">398</FONT>         *     &lt;/td&gt;<a name="line.398"></a>
<FONT color="green">399</FONT>         *   &lt;/tr&gt;<a name="line.399"></a>
<FONT color="green">400</FONT>         * &lt;/table&gt;<a name="line.400"></a>
<FONT color="green">401</FONT>         * <a name="line.401"></a>
<FONT color="green">402</FONT>         * @throws Exception<a name="line.402"></a>
<FONT color="green">403</FONT>         *<a name="line.403"></a>
<FONT color="green">404</FONT>         * @param strBuffer we store the result of evaluating the queryList in the<a name="line.404"></a>
<FONT color="green">405</FONT>         *                    strBuffer<a name="line.405"></a>
<FONT color="green">406</FONT>         * @see<a name="line.406"></a>
<FONT color="green">407</FONT>         *   &lt;a href=<a name="line.407"></a>
<FONT color="green">408</FONT>         *      "../../srchtml/project3/DatalogProgram.html#evaluateQueryList"<a name="line.408"></a>
<FONT color="green">409</FONT>         *      &gt;Source Code<a name="line.409"></a>
<FONT color="green">410</FONT>         *   &lt;/a&gt;<a name="line.410"></a>
<FONT color="green">411</FONT>         */<a name="line.411"></a>
<FONT color="green">412</FONT>        public void evaluateQueryList(StringBuffer strBuffer)<a name="line.412"></a>
<FONT color="green">413</FONT>            throws Exception<a name="line.413"></a>
<FONT color="green">414</FONT>        {<a name="line.414"></a>
<FONT color="green">415</FONT>            assert strBuffer != null;<a name="line.415"></a>
<FONT color="green">416</FONT>            queryList.evaluate(strBuffer);<a name="line.416"></a>
<FONT color="green">417</FONT>        }<a name="line.417"></a>
<FONT color="green">418</FONT>    <a name="line.418"></a>
<FONT color="green">419</FONT>    //Auxillary Methods and Constants<a name="line.419"></a>
<FONT color="green">420</FONT>    }<a name="line.420"></a>




























































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